#pragma once
#include <pthread.h>
#include <vector>
#include <iostream>
#include <string>
#include <semaphore.h>
#include "LockGuard.hpp"
const int defaultsize = 5;

template <class T>
class RingQueue
{
public:
    RingQueue(int capacity = defaultsize)
        : _ringqueue(capacity), _capacity(capacity), _p_step(0), _c_step(0)
    {
        sem_init(&_space_sem, 0, _capacity);
        sem_init(&_data_sem, 0, 0);
        pthread_mutex_init(&_p_mutex,nullptr);
        pthread_mutex_init(&_c_mutex,nullptr);

    }
    void Push(const T &in)
    {
        P(&_space_sem);
        {
            LockGuard lockguard(&_p_mutex);
            _ringqueue[_p_step] = in;
            _p_step++;
            _p_step %= _capacity;
        }
        V(&_data_sem);
    }

    void Pop(T *out)
    {
        P(&_data_sem);
        {
            LockGuard lockguard(&_c_mutex);
            *out = _ringqueue[_c_step];
            ++_c_step;
            _c_step %= _capacity;
        }
        V(&_space_sem);
    }

    ~RingQueue()
    {
        sem_destroy(&_space_sem);
        sem_destroy(&_data_sem);
        pthread_mutex_destroy(&_p_mutex);
        pthread_mutex_destroy(&_c_mutex);

    }

private:
    void P(sem_t *sem)
    {
        sem_wait(sem);
    }

    void V(sem_t *sem)
    {
        sem_post(sem);
    }

private:
    std::vector<T> _ringqueue;
    int _capacity;
    int _p_step;
    int _c_step;

    sem_t _space_sem;
    sem_t _data_sem;

    pthread_mutex_t _p_mutex;
    pthread_mutex_t _c_mutex;
};

